cottongin/crosspoint-reader
1
0
Fork 0
Code Issues Pull Requests Actions 1 Packages Projects Releases 4 Wiki Activity

fix: #348 fit cover artifacts - merge crop parameter (#465)

Browse Source 
Cherry-picked from upstream PR #465
Resolved conflicts: merged crop parameter with existing progressCallback,
kept local dimension calculation and edge luminance caching logic
This commit is contained in:
cottongin 2026-01-27 07:50:37 -05:00
parent 6ffd19a7e8
commit c90304f59b
No known key found for this signature in database
GPG Key ID: 0ECC91FE4655C262
3 changed files with 16 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
lib/Epub/Epub.cpp
View File

@ -447,7 +447,7 @@ bool Epub::generateCoverBmp(bool cropped) const {
if (coverImageHref.substr(coverImageHref.length() - 4) == ".jpg" ||
coverImageHref.substr(coverImageHref.length() - 5) == ".jpeg") {
Serial.printf("[%lu] [EBP] Generating BMP from JPG cover image\n", millis());
Serial.printf("[%lu] [EBP] Generating BMP from JPG cover image (%s mode)\n", millis(), cropped ? "cropped" : "fit");
const auto coverJpgTempPath = getCachePath() + "/.cover.jpg";
FsFile coverJpg;

19
lib/JpegToBmpConverter/JpegToBmpConverter.cpp
View File

@ -200,7 +200,8 @@ unsigned char JpegToBmpConverter::jpegReadCallback(unsigned char* pBuf, const un
// Internal implementation with configurable target size and bit depth
bool JpegToBmpConverter::jpegFileToBmpStreamInternal(FsFile& jpegFile, Print& bmpOut, int targetWidth, int targetHeight,
bool oneBit, const std::function<void(int)>& progressCallback) {
bool oneBit, bool crop,
const std::function<void(int)>& progressCallback) {
Serial.printf("[%lu] [JPG] Converting JPEG to %s BMP (target: %dx%d)\n", millis(), oneBit ? "1-bit" : "2-bit",
targetWidth, targetHeight);
@ -242,8 +243,12 @@ bool JpegToBmpConverter::jpegFileToBmpStreamInternal(FsFile& jpegFile, Print& bm
const float scaleToFitWidth = static_cast<float>(targetWidth) / imageInfo.m_width;
const float scaleToFitHeight = static_cast<float>(targetHeight) / imageInfo.m_height;
// We scale to the smaller dimension, so we can potentially crop later.
// TODO: ideally, we already crop here.
const float scale = (scaleToFitWidth > scaleToFitHeight) ? scaleToFitWidth : scaleToFitHeight;
float scale = 1.0;
if (crop) { // if we will crop, scale to the smaller dimension
scale = (scaleToFitWidth > scaleToFitHeight) ? scaleToFitWidth : scaleToFitHeight;
} else { // else, scale to the larger dimension to fit
scale = (scaleToFitWidth < scaleToFitHeight) ? scaleToFitWidth : scaleToFitHeight;
}
outWidth = static_cast<int>(imageInfo.m_width * scale);
outHeight = static_cast<int>(imageInfo.m_height * scale);
@ -556,22 +561,22 @@ bool JpegToBmpConverter::jpegFileToBmpStreamInternal(FsFile& jpegFile, Print& bm
}
// Core function: Convert JPEG file to 2-bit BMP (uses default target size)
bool JpegToBmpConverter::jpegFileToBmpStream(FsFile& jpegFile, Print& bmpOut) {
return jpegFileToBmpStreamInternal(jpegFile, bmpOut, TARGET_MAX_WIDTH, TARGET_MAX_HEIGHT, false, nullptr);
bool JpegToBmpConverter::jpegFileToBmpStream(FsFile& jpegFile, Print& bmpOut, bool crop) {
return jpegFileToBmpStreamInternal(jpegFile, bmpOut, TARGET_MAX_WIDTH, TARGET_MAX_HEIGHT, false, crop, nullptr);
}
// Convert with custom target size (for thumbnails, 2-bit)
bool JpegToBmpConverter::jpegFileToBmpStreamWithSize(FsFile& jpegFile, Print& bmpOut, int targetMaxWidth,
int targetMaxHeight,
const std::function<void(int)>& progressCallback) {
return jpegFileToBmpStreamInternal(jpegFile, bmpOut, targetMaxWidth, targetMaxHeight, false, progressCallback);
return jpegFileToBmpStreamInternal(jpegFile, bmpOut, targetMaxWidth, targetMaxHeight, false, true, progressCallback);
}
// Convert to 1-bit BMP (black and white only, no grays) for fast home screen rendering
bool JpegToBmpConverter::jpegFileTo1BitBmpStreamWithSize(FsFile& jpegFile, Print& bmpOut, int targetMaxWidth,
int targetMaxHeight,
const std::function<void(int)>& progressCallback) {
return jpegFileToBmpStreamInternal(jpegFile, bmpOut, targetMaxWidth, targetMaxHeight, true, progressCallback);
return jpegFileToBmpStreamInternal(jpegFile, bmpOut, targetMaxWidth, targetMaxHeight, true, true, progressCallback);
}
// Get JPEG dimensions without full conversion

5
lib/JpegToBmpConverter/JpegToBmpConverter.h
View File

@ -10,10 +10,11 @@ class JpegToBmpConverter {
static unsigned char jpegReadCallback(unsigned char* pBuf, unsigned char buf_size,
unsigned char* pBytes_actually_read, void* pCallback_data);
static bool jpegFileToBmpStreamInternal(class FsFile& jpegFile, Print& bmpOut, int targetWidth, int targetHeight,
bool oneBit, const std::function<void(int)>& progressCallback = nullptr);
bool oneBit, bool crop,
const std::function<void(int)>& progressCallback = nullptr);
public:
static bool jpegFileToBmpStream(FsFile& jpegFile, Print& bmpOut);
static bool jpegFileToBmpStream(FsFile& jpegFile, Print& bmpOut, bool crop = true);
// Convert with custom target size (for thumbnails)
static bool jpegFileToBmpStreamWithSize(FsFile& jpegFile, Print& bmpOut, int targetMaxWidth, int targetMaxHeight,
const std::function<void(int)>& progressCallback = nullptr);